the pres. mouth
the place where flatus is produced, distibuted.
One secret service guy says to another, "did you smell the pres. mouth,it always smells like shit.
Mouth pre
(adj.) Drool hanging from a dog's mouth. Specifically one salivating over the smells or sight of an upcoming treat.
Frank the dog gets so excited when I'm chopping carrots he starts mouth pre-ing all over the kitchen.